# Set Billing Rates

During day-to-day system operation, 120 different statistics are kept for each mailbox, including mailbox access counters, message counters, connect time accumulators, disk usage accumulation, and page counter. For each statistic, different rates can be set for high and low usage, and for a boundary. This tiered rate system gives you the option to charge set rates or to give volume discounts.

- Low usage rate is the rate charged, up to the boundary number. A 0 (zero) prevents this rate from appearing on the Billing Report.

- High usage rate is the rate charged after the boundary number is reached. If you want to use this rate, be sure to enter a boundary.

- Boundary is where the rate changes from the low usage rate to the high usage rate. A 0 (zero) means all usage is charged at the low rate.

If you need to enter new billing rates or adjust existing rates the system’s various counters and accumulators determine the charges. A different billing rate can be set for each resource counter.

## Set Billing Rates for Each Counter

You can set billing rates for each counter. With the exception of Base rates, which are flat fees, you can enter a separate high and low usage rate, along with a boundary rate, for each resource (See About Resource Counters).

To give volume discounts, enter a lower amount for the high usage rate than for the low usage rate. To penalize heavy usage, enter a higher amount for the high usage rate. Boundary values are charged at the lower rate. Each boundary value is set in the same unit as the individual resource. To charge a standard rate, enter 0 (zero) in the boundary number field.

You can also generate reports of the current rates. See the Reports section for more information.